报告人：Martin Forbes（新西兰奥塔哥大学 研究员）
Martin did his undergraduate studies at the National Institute of Applied Sciences in Lyon, France where he obtained an Engineering Diploma in Mechanical Engineering with a focus on numerical simulations. He then worked for 3 and a half years in a private non-profit research center in Belgium called Cenaero. There he worked on crack propagation and welding simulations for aeronautical engine components. Switching to applications more in line with his interests in the outdoors and geophysics, Martin, then did a PhD at the University of Otago applying fracture mechanics numerical approaches to better understanding ice shelf rifts.
Laterally propagating, through-cutting rifts govern the iceberg calving component of Antarctic ice-shelf mass balance and determine the geometry of the seaward fronts of these floating ice masses. Despite their importance, physical limits on rift propagation are not well understood and there are no readily accessible modelling frameworks with which to study rift processes in realistic ice shelf conditions. To achieve this a modeling framework must describe the total stress tensor in the vicinity of the rift tips. When total extensive stress normal to the rift exceeds a threshold, propagation should occur until the total stress drops below the threshold. Typically, driving-stresses associated with the overall geometry of the ice shelf are used for this, however, local and potentially transient, contributions to the total stress should be accounted. In this lecture, a novel numerical approach that applies linear elastic fracture mechanics (LEFM) developed for this purpose and applied in a central Ross Ice Shelf case study will be introduced.